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drilling lubricant
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  1. General DIY Discussions
    A quick poll of experiences in drilling holes in metal. We have a new shop foreman (in his twenties) who thinks that using sae 30 motor oil is OK to use as a cooling lubricant when drilling holes in metal. I prefer to use a low speed- 300-400 rpm- whether or not I have CUTTING OIL available. I...
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